that PUABundler is a possibly unwanted addon included with the software you downloaded. Not a great thing for any software company to do although it wouldn't strictly be classified as malware or a virus.. just something you may not want. This describes the issue with another popular program.. CCcleaner which many of us here use....

https://www.tenforums.com/antivirus-...m-bundler.html

If you're still concerned it would be worth trying to re-install the older version that you had instead of the new one. Older versions incl the one you had can be found here:

https://filehippo.com/download_fasts...iewer/history/


Also FWIW I use and did try the new version of FastStone about six months ago but it did not run very well on my older computer for some reason so I went back to 6.8